Back Pressure - Understand the Balance

[Phantom Mark]

So I am looking at modifying my standard exhaust here, I have the welding ability just want to make sure I get the principles right.

I removed both back boxes just to see how it would sound with straight pipes, sounded rough as fek and when I went for a quick spin felt like the lack of back pressure from the back boxes had reduced the throttle response, no idea if the power went down of course.

So with this in mind I am planning on removing the centre box but retaining the standard back boxes for the moment.

Just wanted to ask how you work out how much back pressure you need, or indeed if you need back pressure ???

The only reason I ask is that I was looking at a Corvette L88 the other day with race pipes on, litrally straight through side exits with no baffles I could see..........I assume this has no "back pressure?" so this left me wondering ????

By the way, the centre box on the R8, looks like both sides come together into a centre collector ?? must this be retained, or should I be ok to simple replace that box with straight through individual pipes, I remember reading another thread here about "X" sections and how they do something or another, cant remember what now ??

TIA

[Phantom Mark]

Thanks guys......

Wonder if I would get the same result by removing my middle box then, the exhausts appear quite different to the Ro ? from what I have seen anyways.

Anybody else done this mod ??

Just having trouble justifying nearly 1200 quid for some bloody tunes out of my V8 !!

I had a full custom made stainless system for my 6cyl BMW made for around £300 quid and that was gorgeous with lifetime warranty !!!

[Phantom Mark]

Bugger thats a lot of effort for not a lot of result

Be interested to know how you got the end off so clean tho ??

Im thinking if you did the mid section and kept the rear box mod you have there it would maybe compliment each nicely ?

[Phantom Mark]

Thanks Eliot